|Publication number||US4315308 A|
|Application number||US 05/972,007|
|Publication date||Feb 9, 1982|
|Filing date||Dec 21, 1978|
|Priority date||Dec 21, 1978|
|Publication number||05972007, 972007, US 4315308 A, US 4315308A, US-A-4315308, US4315308 A, US4315308A|
|Inventors||Daniel K. Jackson|
|Original Assignee||Intel Corporation|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (10), Referenced by (211), Classifications (4)|
|External Links: USPTO, USPTO Assignment, Espacenet|
1. Field of the Invention
The present invention relates to microprocessors, and more particularly to apparatus for controlling the movement of data off of and onto a microprocessor chip.
2. Description of the Prior Art
Computer systems have in the past been concerned with the movement of digital data between modules in the system. Traditionally, the central processing unit has been packaged separately from memory units and peripheral input/output devices such as disc files, printers, and magnetic tape storage units. Prior to the development of large-scale integration (LSI) technology, the interface between units was mainly concerned with transferring data at the highest speed possible commensurate with the electrical characteristics of the cables between the units and the electronic circuits which drive signals on the cables. An example of such an interface in wide use today is that used on the IBM System/360 computers between input/output devices and the input/output channel of the main processor. This interface is described in U.S. Pat. No. 3,336,582--Interlocked Communication System--Beausoleil et al, filed Sept. 1, 1964, and issued Aug. 15, 1967. This I/O interface provides for a data format and control signal sequence definition which is common to all control units which can be attached to the system. The rise and fall of all signals transmitted over the interface are controlled by corresponding interlocked responses. In such a system there is no practical limit on the number of lines which can be utilized between the units, and, therefore, a separate bus is provided for address information and data information. The width of the data bus is conveniently made equal to the width of data words utilized within the data processing unit. Furthermore, the address bus is made equal to the width of the data word used for address development. The IBM System/360 Interface therefore uses nine lines to represent bus out which is used to transmit data, I/O device addresses, commands, and control orders to the peripheral devices. Furthermore, a separate set of nine lines, bus in, is used to transmit data, selected I/O device identification, status information, and sense data from the peripheral devices. In addition, more than 16 simplex input and output lines are utilized for controlling information on the buses, for special sequences, for the scanning of or selection of attached input/output devices, and for usage meters. A total of over 34 lines are used to control data movement.
The use of such an interface with microprocessors is prohibitive because there are not enough input/output pins available on the LSI package with present-day technology. To solve this problem, microprocessors have to use fewer actual lines interconnecting the modules, but still have the requirement of being able to handle data movement and control operations just as complex as those of previous data processing systems. This has been accomplished in the past by providing bidirectional information bus lines which carry information first in one direction, and then in another direction, thus avoiding duplication of the signal lines. The number of bus lines required is further reduced in prior microprocessors by multiplexing the address of the peripheral device on the data bus and synchronizing the output of both address and data on the output buses. Furthermore, data transfer control signals have been encoded to simplify read and write input/output and memory operations, thus resulting in reduced pin requirements. In addition to a line carrying system clock signals, a typical microprocessor interface would include the following lines:
Two status signal lines are utilized to encode the status of the data transfer, read, write, halt, or fetch. One control line is utilized to indicate whether the device being addressed is a memory device or an I/O device. One line is utilized by an external device to signal a request that the device needs the address and data bus. Another line from the microprocessor indicates to the external device that the abovementioned request has been acknowledged. A separate line is utilized by the peripheral to generate an interrupt request. A single line is utilized by the microprocessor to latch address information into the peripheral device. An 8-bit address bus and a separate 8-bit data bus complete the minimum lines necessary for this type of interface. If a 16-bit address is utilized, the data bus carries a portion of the address word during an address cycle. In a subsequent cycle this bus is used to carry data.
As seen from the above, it takes 23 lines to provide the functions described.
As more and more complex functions are incorporated on a microprocessor chip, the number of pins dedicated to input/output functions becomes more critical. This is particularly true where large microprocessors are partitioned between two or more chips. This means that more and more pins have to be dedicated to interchip control signals, thus making fewer pins available for input/output operations. It is therefore desirable to further reduce the number of bidirectional information bus lines and other pins utilized while maintaining a simplified data transfer protocol between the microprocessor and peripheral units.
Briefly, the present invention utilizes a single bidirectional address/control/data bus in combination with two simplex control lines to perform all complex address control and data transfer functions. This is accomplished by assigning different functions to these lines during sequential cycles of a data transfer operation. During a first cycle the bus carries a control data specification and the low order bits of the peripheral address. The control specification is encoded to provide information indicating the type of access (memory device or I/O device), the direction of data transfer (read or write), the length of data to be transferred (1 byte, 2 bytes, etc.), and modifier bits which further define the type of access being undertaken. Interprocessor communication (IPC) is signaled during this first cycle by lowering the simplex control line from the peripheral device to the microprocessor.
During the second cycle the remainder of the address information is placed on the bus and the simplex line from the microprocessor to the peripheral is asserted to indicate that valid data is on the bus. Subsequent cycles are utilized to transfer data (up to 16 bits at a time) until the total number of bytes has been transferred. During these multiple cycles the simplex line from the peripheral device to the microprocessor is asserted high to indicate that valid data is on the bus during a read cycle or that data has been accepted during a write cycle. Error information is signaled at the end of a read or write cycle by holding this particular simplex line low.
Sophisticated data communication messages are transferred by means of an interprocessor communication mechanism which is more fully described in copending patent application Ser. No. 972,010 entitled "Interprocessor Communications Apparatus" by George Cox and Justin Rattner, filed on Dec. 21, 1978.
The invention has the advantage that in one transaction a variable-length data transfer takes place with the transmission of only one set of address and control specification information. Prior microprocessors are constrained to issue data transfer requests which are closely related to the physical width of the memory (8 or 16 bits). The present invention encodes a complex data transfer request into a compact two-cycle control specification, which may direct an external unit (such as a memory) to transfer up to 20 bytes of information.
A further advantage of the invention is that address information does not have to be maintained on a separate bus for the several cycles during which data is transferred because the length information indicates to the peripheral device the number of bytes to be stored in the address specified during the first and second cycle. Thus the address information can be latched in the peripheral and the address bus used to transfer data.
A further advantage of the invention is that simplex lines for encoding status information and information indicating whether the peripheral device is a memory or an I/O device can be eliminated because this information is placed directly on the data bus during the first cycle of an operation.
The invention has the further advantage that only two simplex lines are needed to synchronize data and to perform error functions and interprocessor communication functions because these lines are assigned different meanings at different times during the cycles of a complete operation.
It can thus be seen that the present invention performs a complex information transfer operation over an interface by using a bare minimum of signal lines.
The foregoing and other objects, features and advantages of the invention will be apparent from the following detailed description of a preferred embodiment of the invention as illustrated in the accompanying drawings wherein:
FIG. 1 is a functional block diagram illustrating the various components of a microprocessor in which the invention is embodied;
FIG. 2 is a timing diagram which shows the functions of the various interface lines during various cycles of a data transfer operation;
FIG. 3 is a table setting forth the control specifications for the address, control, and data bytes;
FIG. 4 is a more detailed block diagram of those components of the instruction unit shown in FIG. 1 which are necessary for an understanding of the present invention;
FIG. 5 is a block diagram of those components of the execution unit shown in FIG. 1 which are necessary for an understanding of the present invention;
FIG. 6 is a block diagram of those components of the bus interface unit shown in FIG. 1 which are necessary for a complete understanding of the present invention;
FIG. 7 is a timing diagram which shows the nominal read timing;
FIG. 8 is a timing diagram which shows the minimum read timing;
FIG. 9 is a timing diagram which shows a nominal write timing; and,
FIG. 10 is a timing diagram which shows a minimum write timing.
FIG. 1 is a block diagram of a microprocessor in which the present invention is embodied. The overall system is more fully described in copending patent application entitled "Data Processing System" by Steven R. Colley, et al, application Ser. No. 971,661, filed on Dec. 21, 1978. As more fully described in the above-referenced application, a microprocessor 200 is attached to a bus interface unit 201 which provides for interface control of data transfers between the processor 200 and other units such as memories, I/O devices, or other processors in the system.
The microprocessor is comprised of two separate chips, one for the instruction unit 210, and the other for the execution unit 212. Communication between the instruction unit and the execution unit is over an interchip bus. The instruction unit is shown in more detail in FIG. 4 and the execution unit is shown in more detail in FIG. 5. The logic shown in these figures is only that which is necessary for an understanding of the present invention. A more detailed description of these two units is found in the above-identified Colley et al patent application.
Off-chip communication with external processors, memories, or peripheral devices is accomplished by means of an interface which communicates with a bus interface unit 201 more fully described in FIG. 6. The interface lines as a minimum are comprised of a clock line (CLKA not shown in FIG. 1), an address/control/data bus 214 which includes a plurality of bidirectional lines, a simplex line (ISA) 215 from the execution unit 212 to the instruction unit 210 and the bus interface unit 201, and a simplex line (ISB) 216 from the bus interface unit 201 to the instruction unit 210 and the execution unit 212. It should be understood that the processor 200 could be implemented on a single chip, and that the present invention is not limited to the specific two-chip configuration shown in FIG. 1.
These 16 lines comprise a bidirectional address/control/data bus. The lines are output from the execution unit to indicate the action desired to the bus interface. In the other direction, the bus is input to the instruction unit and the execution unit from the bus interface to carry information read in.
The ISA line 215 is output from the execution unit to the instruction unit and the bus interface unit. Referring to FIG. 2, ISA is low whenever no transaction is taking place between the processor and external units. ISA is high whenever a transaction is under way, such as during the second cycle when address data is on the ACD bus and the third and subsequent cycles when read or write data is being transferred. ISA is low for the first cycle of a transaction when lines 15-8 of the ACD bus carry a control specification and when ACD 7-0 carry the low 8 bytes of the address for memory references. ISA is high during the second cycle when the high order 16 address bits of a memory reference are on the ACD bus. During this cycle a request is canceled by asserting ISA low. ISA is low during the last cycle of a write operation (which may serve also as the first cycle of the subsequent transaction).
ISB is a simplex line from the bus interface unit to both the instruction unit and the execution unit. ISB can have three different types of significance depending upon the cycle during which it is asserted. ISB has either interprocessor communication (IPC) significance, stretch significance, or error significance.
Whenever ISA is low, ISB has IPC significance, for example, during the first and second cycles shown in FIG. 2. Whenever ISA is low, ISB has IPC significance except in the first cycle following a write type of transaction (as specified by bit 14 of the control specification shown in FIG. 3), in which event ISB has error significance.
ISB also has IPC significance in the first cycle of a transaction during which ISA is high, for example, during the second cycle shown in FIG. 2. Thereafter ISB has stretch significance for the remainder of the time ISA is high except in the last cycle of a read transaction when it has error significance.
Stretch significance means that read or write data is stretched over several cycles depending upon the length of data to be transferred as specified by bits 10, 11, and 12 in the control specification, FIG. 3.
Referring now to FIG. 2, the basic operation of the interface will now be described. For simplicity of illustration, only one bus interface unit is shown connected to the interface. It is understood that more than one bus interface unit can be utilized in the practice of the present invention. Timing synchronization between the units shown in FIG. 1 is provided by a clock signal (CLKA) which is connected to each of the units. A read or write operation takes place over several clock cycles. Prior to the start of a read or write operation the ACD bus is energized by the execution unit to generate all ones (called a "null" specification). ISA is asserted by the execution unit during this period. ISB is normally asserted high by the bus interface unit to indicate that there is no interprocessor communication message waiting to be transferred to the processor 200. The function of the IPC operation is more fully described in the above-mentioned copending patent application entitled "Interprocessor Communication Apparatus" by George Cox and Justin Rattner. The execution unit commences a data transfer operation in response to an access memory type of microinstruction received from the instruction unit 210. The execution unit 212 generates the physical address of the reference and issues the least significant byte of the address along with control information specifying the type of reference and the number of bytes to be transferred. The control specification is shown in detail in the table of FIG. 3. The bus interface unit monitors the ACD bus. When it changes from a "null" specification, then the bus interface clocks the least significant byte of address and the control specification into registers in the bus interface unit 201. During the second cycle the execution unit places the most significant byte of address information on the ACD bus and asserts ISA high to indicate to the bus interface unit that the address information is now on the bus. The execution unit is able to cancel the request by asserting ISA low (instead of high) during this second cycle, which will be interpreted by the bus interface as a canceled request signal, even though information may still be on the ACD bus.
The processor 200 may issue requests for one, two, four, six, eight, ten, sixteen, or twenty bytes of data to be transferred. This length information is part of a control field which was transmitted during the first cycle of the transaction. As the data bytes are returned from memory (for a read request), they are buffered and aligned by the bus interface unit and transferred to the processor 200 in the correct order. During the third cycle of a write transaction, the execution unit places write information on the ACD bus, holds ISA asserted high and waits for ISB to be asserted high, thus indicating that the bus interface unit has accepted the write data. If data transfer is to be in the opposite direction, the execution unit waits during the third cycle until ISB is asserted high. This indicates that the bus interface unit has placed read data on the ACD bus and that the data is valid. Cycles similar to that described for the third cycle are repeated until all the bytes of data indicated by the length control specification generated during the first cycle are received. During the last cycle a "null" (all ones) is generated on the ACD bus and ISA is brought low by the execution unit to end the write operation. An error is signaled by ISB being asserted low by the bus interface unit. During a read operation ISA is brought low in the cycle following the last cycle and ISB again has error significance in the last cycle. In this manner, ISA is used to signal the end of a write operation by going from high to low during the last cycle of a write operation. ISA is held asserted high during a read operation for the last cycle during which time ISB has error significance. During a write operation the execution unit places all ones on the ACD bus during the last cycle and asserts ISA low. ISB is then used to signal an error condition, high for no error and low for error.
The logic for performing the interface functions just described is shown in more detail in FIGS. 4, 5, and 6. Only those portions concerned with controlling interface sequences will be discussed so that the present invention can be more easily understood. A much more detailed description of the operation of the various units is given in the above-identified Colley et al patent application. Wherever possible throughout this specification the same reference numerals are used to identify the same system blocks shown in the aforementioned application.
Referring to FIG. 4, the instruction unit is a macroinstruction decoder which decodes an instruction stream and transfers the microinstructions necessary to execute the stream to the execution unit of FIG. 5 over the interchip bus. In addition, the instruction unit also transfers logical address information to holding registers in the execution unit. The execution unit, described subsequently, decodes and executes the microinstructions received from the instruction unit.
The instruction unit is comprised of two main blocks, the instruction decoder 222 and the microinstruction sequencer 224. The instruction decoder (ID) receives instructions from the ACD bus 214 and latches them into the instruction decoder by means of the valid instruction fetch data line 221 which is generated by the microinstruction sequencer in response to the state of the ISA and ISB interface lines. The ID interprets the fields of the instruction and generates the microinstructions (or starting address for the longer microinstruction routines) which are necessary to execute the macroinstruction. In addition, the ID formats logical address information for subsequent transfer to holding registers on the execution unit.
The microinstruction sequencer (MIS) 224 contains the control circuitry for sequencing through the various microinstruction flows necessary to execute the macroinstructions. The MIS receives starting addresses for microinstruction routines from the ID, decodes the microinstructions from a microprogrammed ROM to control the microprogrammed sequencing, and transfers the microinstructions over the interchip bus to the execution unit where they are executed. By monitoring ISA and ISB, the microinstruction sequencer is able to determine when valid data is on the ACD bus 214. For example, when ISA is high after the second cycle of a data transfer, ISB is asserted high to indicate that valid read information is on the bus. In response to this indication the microinstruction sequencer MIS generates a signal on the line 221 to thereby energize AND circuit 223 thus gating information on the ACD bus into the instruction decoder 222.
Referring now to FIG. 5, the microinstruction stream is received by the execution unit over the interchip bus. The interchip bus is connected to logic block 225 which includes the data manipulation unit (DMU), reference generation unit (RGU), and control unit (CU) logic which is fully described in the above-described Colley et al patent application.
Briefly, the DMU performs arithmetic, logical, and execution operations on data brought in during the course of program execution. The RGU builds 24-bit physical addresses from logical addresses in the macroinstruction and issues addresses. The control unit receives microinstructions from the instruction unit, retains them, and exercises the DMU and the RGU. Many other functions are performed by the logic 225; however, for purposes of this specification, only those functions which pertain to the operation of the present invention are shown in FIG. 5.
The execution unit drives a "null" specification on the ACD bus whenever there is no transaction in progress by energizing line 236 which forces all ones onto the ACD bus lines. Also, ISA is forced low. Once the execution unit receives an access memory type of microinstruction from the instruction unit, it generates the physical address of the reference and stores it in address register 238. The least significant byte of the address is outputted to GATE circuit 240. The most significant bytes in the remainder of the address are outputted to GATE circuit 242. The logic 225 also composes control information specifying the type of reference and the number of bytes to be transferred, whether the operation is a read or write operation along with certain modifier bytes shown and described previously with respect to FIG. 3. This control specification is stored in a control specification register 244. The control specification register is outputted to GATE circuit 246. During cycle one, generated by the logic 225, GATE circuits 240, 246 are energized to thus gate the low order byte of the address from address register 238 along with the control specification to the ACD bus 214. At the same time the logic 225 asserts the ISA line 215 low.
During the next cycle, the logic 225 energizes the cycle two line and disenergizes the cycle one line. This causes GATE circuit 242 to be energized, thus forcing the most significant bytes of the remainder of the address, stored in register 238, onto the ACD bus. At the same time the logic 225 asserts the ISA line 215 high. A request is canceled (e.g., due to a bounds violation) by asserting ISA low at this time.
The execution unit monitors the ISB line, 216, from the bus interface unit. A low on the ISB line when a bus transaction is not in progress (ISA is low) indicates to the processor that there is an interprocessor communication (IPC) waiting for it. The logic for performing this function is comprised of OR circuit 252, and AND circuit 254. ISB has IPC significance whenever ISA is low, and during the first cycle (cycle two) that ISA is high except when ISB has error significance, which is during the last cycle of a transaction. In that situation when ISB is asserted high, this indicates a no error condition out of AND circuit 256.
ISB is also used by the bus interface to indicate bus errors to the processor. ISB has error significance during the last cycle of a transaction. A low on ISB when it has error significance, AND circuit 256, indicates to the processor that a bus error was detected during the transaction.
During a bus transaction (ISA high), ISB has "stretch" significance whenever it does not have IPC or error significance. This is represented by the logic of AND circuit 259, which energizes AND circuits 258 and 260 whenever it is not cycle one, but cycle two, or not the last cycle of an operation. Under these conditions ISB is given stretch significance. Thus, during a read operation, an output from AND circuit 258 indicates to the logic 225 that valid data has been placed by the bus interface onto the ACD bus. Similarly, during a write operation, an output from AND circuit 260 indicates (ISB high) that data has been accepted by the bus interface unit.
If the bus interface has not accepted the write data, the processor keeps the data on the ACD bus until it is accepted.
As stated previously, if a read transaction is an instruction fetch, the data is latched into the instruction unit. If the read transaction is a data fetch, the data is latched into the execution unit by energizing data fetch line 262 which gates the information on the ACD bus into data register 266. Write transactions are initiated only by the execution unit.
The bus interface unit shown in FIG. 6 terminates and monitors the ACD bus 214 and the ISA line 215. AND circuit 268 detects a "null" pattern and provides an output signal, 269, to the specification decoder and control logic 270. When the interface changes from the null specification (of all ones or some other predetermined bit pattern), an output, 269, is generated and the specification decoder and control logic energizes cycle one line, 272, in response thereto. This line gates the ACD bus into the control specification register 278 and the least significant byte portion of the address register, loadable counter, 280. The control register is decoded. Depending upon the coding of the bits in accordance with FIG. 3, either the memory access line 282 is energized or the other access line, 284, is energized. Further, the direction line 286 is energized for a write operation of deenergized for a read operation. If a write operation is indicated, AND circuit 288 is energized to gate subsequent data into the write data register 290, via gate signal G1. If a read operation is indicated, data is gated from the read data register 292 through driver circuit 294 onto the ACD bus under control of AND circuit 293 and gate signal G2.
During cycle 2 line 296 is energized, thus gating the most significant bits of the address into the most significant bits portion of the address register, loadable counter, 280. The memory address in counter 280 is accepted by the memory module via a memory-address bus if a memory access 282 is indicated. Otherwise, the address is accepted by another module. Similarly, the write data register output 273 is accepted by the memory if a memory access is specified, or by another module if a memory access is not specified. The increment line from logic 270 to the loadable counter 280 increments the counter to provide sequential addresses corresponding to sequential bytes of data to be moved, as specified by bits 10, 11, and 12 in the control specification, FIG. 3.
Two additional outputs are provided, buffer in (BIN) and buffer out (BOUT), FIG. 5, to control bus transceivers to buffer and isolate the processor from other processors. The use of buffers may be desired in systems with heavy pin loading. BIN is asserted low when information is to enter the instruction unit or the execution unit on the ACD bus. BOUT is asserted high when information is to leave the execution unit on the ACD lines. The timing of BOUT and BIN is shown in FIGS. 7 and 8.
In FIG. 7 a 32-byte read access is shown. Since the ACD bus is two bytes in width (i.e., 16 bits), two read data cycles are necessary to transfer the information. Initially the ACD bus is asserted "null" (all ones). The execution unit receives a 32-byte read access on the ICB (interchip bus). In response to this, it generates part of the address and a control specification during cycle one of the transaction.
During cycle two the execution unit raises ISA and places the remainder of the address on ACD. The execution unit lowers BOUT and BIN, thus energizing the input buffers. As soon as the interface unit has fetched the data from the memory address specified, it places the data on the ACD bus and asserts ISB positive during cycle five. It then lowers ISB and fetches the next data byte, taking into consideration the length information specified by the control bytes. The interface unit places the second two bytes of data on ACD and again raises ISB.
During the last cycle ISB has error significance and is asserted low if an error has been detected by the bus interface unit.
BIN and BOUT are asserted high at the end of the read transaction by the execution unit.
FIG. 8 is a timing diagram illustrating a minimum read timing. Here the read access would be for one or two bytes of data.
FIG. 9 is a timing diagram illustrating nominal write timing for a 32-bit write access. During cycle one part of the address and the entire control specification is placed on ACD. During cycle two ISA is asserted high and the remainder of the address is placed on ACD. During cycle three write data is placed on the ACD bus by the execution unit and the execution unit maintains the write data on the bus until the bus interface unit asserts ISB high. ISB asserted high indicates that the bus interface unit has accepted the write data. The execution unit can now place the second two bytes of write data on the ACD bus. The bus interface unit responds by asserting ISB high which is an indication to the execution unit that it can remove the write data from the ACD bus and go on to the next access. During the last cycle ISB has error significance.
FIG. 10 illustrates the minimum write timing. During the last cycle (which may be the first cycle of the next transaction) the ISB line has error significance.
It will be understood from the foregoing description of the various embodiments that additional modifications and changes in form and details may be made without departing from the spirit and scope of the invention as claimed.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US3739352 *||Jun 28, 1971||Jun 12, 1973||Burroughs Corp||Variable word width processor control|
|US3786436 *||Mar 14, 1973||Jan 15, 1974||Gte Automatic Electric Lab Inc||Memory expansion arrangement in a central processor|
|US3931615 *||Jul 22, 1974||Jan 6, 1976||Scientific Micro Systems||Controller for digital devices|
|US4144562 *||Jun 23, 1977||Mar 13, 1979||Ncr Corporation||System and method for increasing microprocessor output data rate|
|US4145751 *||Apr 18, 1977||Mar 20, 1979||Motorola, Inc.||Data direction register for interface adaptor chip|
|US4156931 *||May 25, 1978||May 29, 1979||Digital Equipment Corporation||Digital data communications device with standard option connection|
|US4172283 *||Dec 8, 1977||Oct 23, 1979||Siemens Aktiengesellschaft||Computer system comprising at least two individual computers and at least one system bus bar|
|US4183084 *||Jun 6, 1977||Jan 8, 1980||Digital Equipment Corporation||Secondary storage facility with serial transfer of control messages|
|US4209838 *||Dec 20, 1976||Jun 24, 1980||Sperry Rand Corporation||Asynchronous bidirectional interface with priority bus monitoring among contending controllers and echo from a terminator|
|US4209841 *||Jul 7, 1978||Jun 24, 1980||Societa Italiana Telecommunicazioni Siemens S.P.A.||Interface unit facilitating data exchange between central processor memory and high-speed peripheral unit|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US4375665 *||Jul 14, 1980||Mar 1, 1983||Texas Instruments Incorporated||Eight bit standard connector bus for sixteen bit microcomputer using mirrored memory boards|
|US4463421 *||Jul 26, 1983||Jul 31, 1984||Texas Instruments Incorporated||Serial/parallel input/output bus for microprocessor system|
|US4466055 *||Mar 17, 1981||Aug 14, 1984||Tokyo Shibaura Denki Kabushiki Kaisha||Information processing system including a one-chip arithmetic control unit|
|US4905137 *||Dec 18, 1987||Feb 27, 1990||North American Philips Corporation Signetics Division||Data bus control of ROM units in information processing system|
|US4956805 *||Sep 22, 1987||Sep 11, 1990||Anasazi, Inc.||Circuitry for character translate functions|
|US4987529 *||Aug 11, 1988||Jan 22, 1991||Ast Research, Inc.||Shared memory bus system for arbitrating access control among contending memory refresh circuits, peripheral controllers, and bus masters|
|US5027272 *||Jan 28, 1988||Jun 25, 1991||Weitek Corporation||Method and apparatus for performing double precision vector operations on a coprocessor|
|US5109494 *||Jun 22, 1990||Apr 28, 1992||Texas Instruments Incorporated||Passive processor communications interface|
|US5125084 *||May 26, 1988||Jun 23, 1992||Ibm Corporation||Control of pipelined operation in a microcomputer system employing dynamic bus sizing with 80386 processor and 82385 cache controller|
|US5148539 *||Jun 4, 1991||Sep 15, 1992||Hitachi, Ltd.||Address bus control apparatus|
|US5163145 *||Apr 25, 1989||Nov 10, 1992||Dell Usa L.P.||Circuit for determining between a first or second type CPU at reset by examining upper M bits of initial memory reference|
|US5191657 *||Nov 9, 1989||Mar 2, 1993||Ast Research, Inc.||Microcomputer architecture utilizing an asynchronous bus between microprocessor and industry standard synchronous bus|
|US5220651 *||Oct 11, 1989||Jun 15, 1993||Micral, Inc.||Cpu-bus controller for accomplishing transfer operations between a controller and devices coupled to an input/output bus|
|US5243703 *||Mar 5, 1992||Sep 7, 1993||Rambus, Inc.||Apparatus for synchronously generating clock signals in a data processing system|
|US5255378 *||Nov 24, 1992||Oct 19, 1993||Intel Corporation||Method of transferring burst data in a microprocessor|
|US5274784 *||Nov 13, 1991||Dec 28, 1993||International Business Machines Corporation||Data transfer using bus address lines|
|US5291586 *||Jul 17, 1992||Mar 1, 1994||International Business Machines Corporation||Hardware implementation of complex data transfer instructions|
|US5319755 *||Sep 30, 1992||Jun 7, 1994||Rambus, Inc.||Integrated circuit I/O using high performance bus interface|
|US5379443 *||Oct 8, 1993||Jan 3, 1995||Intel Corporation||Microprocessor providing encoded information on byte enable lines indicating whether reading code or data, location of code/data on data lines, and bit width of code/data|
|US5386579 *||Sep 16, 1991||Jan 31, 1995||Integrated Device Technology, Inc.||Minimum pin-count multiplexed address/data bus with byte enable and burst address counter support microprocessor transmitting byte enable signals on multiplexed address/data bus having burst address counter for supporting signal datum and burst transfer|
|US5420989 *||Jun 12, 1991||May 30, 1995||Cyrix Corporation||Coprocessor interface supporting I/O or memory mapped communications|
|US5438666 *||Jun 30, 1992||Aug 1, 1995||Ast Research, Inc.||Shared memory bus system for arbitrating access control among contending memory refresh circuits, peripheral controllers, and bus masters|
|US5440696 *||Jul 1, 1993||Aug 8, 1995||Fujitsu Limited||Data processing device for reducing the number of internal bus lines|
|US5440752 *||Jul 8, 1991||Aug 8, 1995||Seiko Epson Corporation||Microprocessor architecture with a switch network for data transfer between cache, memory port, and IOU|
|US5473575 *||Mar 5, 1992||Dec 5, 1995||Rambus, Inc.||Integrated circuit I/O using a high performance bus interface|
|US5499385 *||Mar 5, 1992||Mar 12, 1996||Rambus, Inc.||Method for accessing and transmitting data to/from a memory in packets|
|US5513327 *||Mar 31, 1994||Apr 30, 1996||Rambus, Inc.||Integrated circuit I/O using a high performance bus interface|
|US5555381 *||May 26, 1995||Sep 10, 1996||Ast Research, Inc.||Microcomputer architecture utilizing an asynchronous bus between microprocessor and industry standard synchronous bus|
|US5564059 *||Dec 19, 1995||Oct 8, 1996||Allen-Bradley Company, Inc.||Simplified protocol for expanding a fixed width bus in an industrial controller|
|US5587962 *||Jun 7, 1995||Dec 24, 1996||Texas Instruments Incorporated||Memory circuit accommodating both serial and random access including an alternate address buffer register|
|US5604865 *||Jun 7, 1995||Feb 18, 1997||Seiko Epson Corporation||Microprocessor architecture with a switch network for data transfer between cache, memory port, and IOU|
|US5606717 *||Mar 5, 1992||Feb 25, 1997||Rambus, Inc.||Memory circuitry having bus interface for receiving information in packets and access time registers|
|US5636176 *||Dec 22, 1994||Jun 3, 1997||Texas Instruments Incorporated||Synchronous DRAM responsive to first and second clock signals|
|US5638334 *||May 24, 1995||Jun 10, 1997||Rambus Inc.||Integrated circuit I/O using a high performance bus interface|
|US5657481 *||Nov 15, 1996||Aug 12, 1997||Rambus, Inc.||Memory device with a phase locked loop circuitry|
|US5680358 *||Jun 7, 1995||Oct 21, 1997||Texas Instruments Incorporated||System transferring streams of data|
|US5680367 *||Jun 7, 1995||Oct 21, 1997||Texas Instruments Incorporated||Process for controlling writing data to a DRAM array|
|US5680368 *||Jun 7, 1995||Oct 21, 1997||Texas Instruments Incorporated||Dram system with control data|
|US5680369 *||Jun 7, 1995||Oct 21, 1997||Texas Instruments Incorporated||Synchronous dynamic random access memory device|
|US5680370 *||Jun 7, 1995||Oct 21, 1997||Texas Instruments Incorporated||Synchronous DRAM device having a control data buffer|
|US5684753 *||Jun 7, 1995||Nov 4, 1997||Texas Instruments Incorporated||Synchronous data transfer system|
|US5754800 *||May 16, 1995||May 19, 1998||Seiko Epson Corporation||Multi processor system having dynamic priority based on row match of previously serviced address, number of times denied service and number of times serviced without interruption|
|US5768205 *||Jun 7, 1995||Jun 16, 1998||Texas Instruments Incorporated||Process of transfering streams of data to and from a random access memory device|
|US5805518 *||Jun 7, 1995||Sep 8, 1998||Texas Instruments Incorporated||Memory circuit accommodating both serial and random access, having a synchronous DRAM device for writing and reading data|
|US5805843 *||Feb 1, 1996||Sep 8, 1998||Qualcomm Incorporated||Microprocessor bus interface unit for interfacing an N-bit microprocessor bus to an M-bit memory device|
|US5809263 *||Dec 9, 1996||Sep 15, 1998||Rambus Inc.||Integrated circuit I/O using a high performance bus interface|
|US5809336 *||Jun 7, 1995||Sep 15, 1998||Patriot Scientific Corporation||High performance microprocessor having variable speed system clock|
|US5841580 *||Feb 10, 1997||Nov 24, 1998||Rambus, Inc.||Integrated circuit I/O using a high performance bus interface|
|US5860028 *||Feb 1, 1996||Jan 12, 1999||Paragon Electric Company, Inc.||I/O bus expansion system wherein processor checks plurality of possible address until a response from the peripheral selected by address decoder using user input|
|US5872996 *||Sep 11, 1997||Feb 16, 1999||Rambus, Inc.||Method and apparatus for transmitting memory requests by transmitting portions of count data in adjacent words of a packet|
|US5896545 *||Sep 9, 1997||Apr 20, 1999||Rambus, Inc.||Transmitting memory requests for multiple block format memory operations the requests comprising count information, a mask, and a second mask|
|US5915105 *||Nov 26, 1997||Jun 22, 1999||Rambus Inc.||Integrated circuit I/O using a high performance bus interface|
|US5928343 *||Jun 16, 1998||Jul 27, 1999||Rambus Inc.||Memory module having memory devices containing internal device ID registers and method of initializing same|
|US5941979 *||Aug 21, 1997||Aug 24, 1999||Seiko Epson Corporation||Microprocessor architecture with a switch network and an arbitration unit for controlling access to memory ports|
|US5954804 *||Feb 10, 1997||Sep 21, 1999||Rambus Inc.||Synchronous memory device having an internal register|
|US5983320 *||Aug 13, 1997||Nov 9, 1999||Rambus, Inc.||Method and apparatus for externally configuring and modifying the transaction request response characteristics of a semiconductor device coupled to a bus|
|US5991841 *||Sep 24, 1997||Nov 23, 1999||Intel Corporation||Memory transactions on a low pin count bus|
|US5995443 *||Mar 4, 1999||Nov 30, 1999||Rambus Inc.||Synchronous memory device|
|US6032214 *||Feb 19, 1999||Feb 29, 2000||Rambus Inc.||Method of operating a synchronous memory device having a variable data output length|
|US6032215 *||Mar 5, 1999||Feb 29, 2000||Rambus Inc.||Synchronous memory device utilizing two external clocks|
|US6034918 *||Feb 19, 1999||Mar 7, 2000||Rambus Inc.||Method of operating a memory having a variable data output length and a programmable register|
|US6044426 *||Jan 29, 1999||Mar 28, 2000||Rambus Inc.||Memory system having memory devices each including a programmable internal register|
|US6065077 *||Dec 7, 1997||May 16, 2000||Hotrail, Inc.||Apparatus and method for a cache coherent shared memory multiprocessing system|
|US6067592 *||Jul 21, 1999||May 23, 2000||Rambus Inc.||System having a synchronous memory device|
|US6070222 *||Mar 8, 1999||May 30, 2000||Rambus Inc.||Synchronous memory device having identification register|
|US6085284 *||Feb 19, 1999||Jul 4, 2000||Rambus Inc.||Method of operating a memory device having a variable data output length and an identification register|
|US6119189 *||Sep 24, 1997||Sep 12, 2000||Intel Corporation||Bus master transactions on a low pin count bus|
|US6131127 *||Sep 24, 1997||Oct 10, 2000||Intel Corporation||I/O transactions on a low pin count bus|
|US6157970 *||Sep 24, 1997||Dec 5, 2000||Intel Corporation||Direct memory access system using time-multiplexing for transferring address, data, and control and a separate control line for serially transmitting encoded DMA channel number|
|US6182184||Feb 22, 2000||Jan 30, 2001||Rambus Inc.||Method of operating a memory device having a variable data input length|
|US6185522 *||May 18, 1998||Feb 6, 2001||U.S. Philips Corporation||Method and system for emulating microcontrollers|
|US6185644||Jan 19, 2000||Feb 6, 2001||Rambus Inc.||Memory system including a plurality of memory devices and a transceiver device|
|US6188635||Jun 7, 1995||Feb 13, 2001||Texas Instruments Incorporated||Process of synchronously writing data to a dynamic random access memory array|
|US6219763||Feb 22, 1999||Apr 17, 2001||Seiko Epson Corporation||System and method for adjusting priorities associated with multiple devices seeking access to a memory array unit|
|US6260097||Feb 28, 2000||Jul 10, 2001||Rambus||Method and apparatus for controlling a synchronous memory device|
|US6272579||Feb 22, 1999||Aug 7, 2001||Seiko Epson Corporation||Microprocessor architecture capable of supporting multiple heterogeneous processors|
|US6289402 *||Jul 23, 1993||Sep 11, 2001||Amiga Development Llc||Bidirectional data transfer protocol primarily controlled by a peripheral device|
|US6292705||Sep 29, 1998||Sep 18, 2001||Conexant Systems, Inc.||Method and apparatus for address transfers, system serialization, and centralized cache and transaction control, in a symetric multiprocessor system|
|US6304937||Sep 25, 2000||Oct 16, 2001||Rambus Inc.||Method of operation of a memory controller|
|US6324120||Feb 8, 2001||Nov 27, 2001||Rambus Inc.||Memory device having a variable data output length|
|US6324591 *||Jul 16, 1997||Nov 27, 2001||France Telecom||Method and device providing time synchronization between a processing unit and external means|
|US6418078||Dec 21, 2000||Jul 9, 2002||Texas Instruments Incorporated||Synchronous DRAM device having a control data buffer|
|US6418537||Jul 8, 1999||Jul 9, 2002||Conexant Systems, Inc.||Accurate timing calibration for each of multiple high-speed clocked receivers using a single DLL|
|US6426916||Feb 27, 2001||Jul 30, 2002||Rambus Inc.||Memory device having a variable data output length and a programmable register|
|US6457087||May 12, 2000||Sep 24, 2002||Conexant Systems, Inc.||Apparatus and method for a cache coherent shared memory multiprocessing system|
|US6466825||Aug 10, 2001||Oct 15, 2002||Conexant Systems, Inc.||Method and apparatus for address transfers, system serialization, and centralized cache and transaction control, in a symetric multiprocessor system|
|US6469988||Jul 8, 1999||Oct 22, 2002||Conexant Systems, Inc.||Low-level circuit implementation of signal flow graphs for real-time signal processing of high-speed digital signals|
|US6470405||May 29, 2001||Oct 22, 2002||Rambus Inc.||Protocol for communication with dynamic memory|
|US6516442||Mar 30, 1999||Feb 4, 2003||Conexant Systems, Inc.||Channel interface and protocols for cache coherency in a scalable symmetric multiprocessor system|
|US6526501||Mar 12, 1999||Feb 25, 2003||Stmicroelectronics Limited||Adapter for a microprocessor|
|US6546446||Dec 21, 2001||Apr 8, 2003||Rambus Inc.||Synchronous memory device having automatic precharge|
|US6564281||Oct 1, 2001||May 13, 2003||Rambus Inc.||Synchronous memory device having automatic precharge|
|US6591353||May 1, 2000||Jul 8, 2003||Rambus Inc.||Protocol for communication with dynamic memory|
|US6598171||Mar 28, 1997||Jul 22, 2003||Rambus Inc.||Integrated circuit I/O using a high performance bus interface|
|US6611908||Jun 21, 2001||Aug 26, 2003||Seiko Epson Corporation||Microprocessor architecture capable of supporting multiple heterogeneous processors|
|US6633945||Jul 8, 1999||Oct 14, 2003||Conexant Systems, Inc.||Fully connected cache coherent multiprocessing systems|
|US6662291||Jul 5, 2002||Dec 9, 2003||Texas Instruments Incorporated||Synchronous DRAM System with control data|
|US6665737||Mar 12, 1999||Dec 16, 2003||Stmicroelectronics Limited||Microprocessor chip includes an addressable external communication port which connects to an external computer via an adapter|
|US6697295||Mar 7, 2001||Feb 24, 2004||Rambus Inc.||Memory device having a programmable register|
|US6697931||Jul 25, 2000||Feb 24, 2004||Stmicroelectronics Limited||System and method for communicating information to and from a single chip computer system through an external communication port with translation circuitry|
|US6715020||Dec 21, 2001||Mar 30, 2004||Rambus Inc.||Synchronous integrated circuit device|
|US6728819||Mar 14, 2002||Apr 27, 2004||Rambus Inc.||Synchronous memory device|
|US6728828||May 23, 2003||Apr 27, 2004||Texas Instruments Incorporated||Synchronous data transfer system|
|US6728829||May 30, 2003||Apr 27, 2004||Texas Instruments Incorporated||Synchronous DRAM system with control data|
|US6732224||May 30, 2003||May 4, 2004||Texas Instrument Incorporated||System with control data buffer for transferring streams of data|
|US6732225||Jun 2, 2003||May 4, 2004||Texas Instruments Incorporated||Process for controlling reading data from a DRAM array|
|US6732226||Jun 2, 2003||May 4, 2004||Texas Instruments Incorporated||Memory device for transferring streams of data|
|US6735667||May 30, 2003||May 11, 2004||Texas Instruments Incorporated||Synchronous data system with control data buffer|
|US6735668||Jun 2, 2003||May 11, 2004||Texas Instruments Incorporated||Process of using a DRAM with address control data|
|US6738860||May 30, 2003||May 18, 2004||Texas Instruments Incorporated||Synchronous DRAM with control data buffer|
|US6748483||Jun 2, 2003||Jun 8, 2004||Texas Instruments Incorporated||Process of operating a DRAM system|
|US6810449||Jan 10, 2000||Oct 26, 2004||Rambus, Inc.||Protocol for communication with dynamic memory|
|US6895465||Mar 31, 2004||May 17, 2005||Texas Instruments Incorporated||SDRAM with command decoder, address registers, multiplexer, and sequencer|
|US6910096||Jun 2, 2003||Jun 21, 2005||Texas Instruments Incorporated||SDRAM with command decoder coupled to address registers|
|US6931467||Mar 8, 2002||Aug 16, 2005||Rambus Inc.||Memory integrated circuit device which samples data upon detection of a strobe signal|
|US6954844||Jun 2, 2003||Oct 11, 2005||Seiko Epson Corporation||Microprocessor architecture capable of supporting multiple heterogeneous processors|
|US6975558||Sep 14, 2004||Dec 13, 2005||Rambus Inc.||Integrated circuit device|
|US7020208||May 3, 2002||Mar 28, 2006||Pericom Semiconductor Corp.||Differential clock signals encoded with data|
|US7110322||Sep 14, 2004||Sep 19, 2006||Rambus Inc.||Memory module including an integrated circuit device|
|US7136971||Feb 10, 2003||Nov 14, 2006||Intel Corporation||Memory controller for synchronous burst transfers|
|US7177998||Jan 18, 2006||Feb 13, 2007||Rambus Inc.||Method, system and memory controller utilizing adjustable read data delay settings|
|US7197611||Feb 15, 2005||Mar 27, 2007||Rambus Inc.||Integrated circuit memory device having write latency function|
|US7200055||Sep 1, 2005||Apr 3, 2007||Rambus Inc.||Memory module with termination component|
|US7209397||Mar 31, 2005||Apr 24, 2007||Rambus Inc.||Memory device with clock multiplier circuit|
|US7209997||Nov 20, 2003||Apr 24, 2007||Rambus Inc.||Controller device and method for operating same|
|US7210016||Nov 15, 2005||Apr 24, 2007||Rambus Inc.||Method, system and memory controller utilizing adjustable write data delay settings|
|US7225292||Sep 1, 2005||May 29, 2007||Rambus Inc.||Memory module with termination component|
|US7225311||Dec 11, 2003||May 29, 2007||Rambus Inc.||Method and apparatus for coordinating memory operations among diversely-located memory components|
|US7287119||Mar 2, 2007||Oct 23, 2007||Rambus Inc.||Integrated circuit memory device with delayed write command processing|
|US7301831||Sep 15, 2004||Nov 27, 2007||Rambus Inc.||Memory systems with variable delays for write data signals|
|US7330952||Mar 27, 2007||Feb 12, 2008||Rambus Inc.||Integrated circuit memory device having delayed write timing based on read response time|
|US7330953||Mar 27, 2007||Feb 12, 2008||Rambus Inc.||Memory system having delayed write timing|
|US7360050||Mar 2, 2007||Apr 15, 2008||Rambus Inc.||Integrated circuit memory device having delayed write capability|
|US7437527||Apr 9, 2007||Oct 14, 2008||Rambus Inc.||Memory device with delayed issuance of internal write command|
|US7480193||May 8, 2007||Jan 20, 2009||Rambus Inc.||Memory component with multiple delayed timing signals|
|US7484064||Oct 22, 2001||Jan 27, 2009||Rambus Inc.||Method and apparatus for signaling between devices of a memory system|
|US7496709||Dec 10, 2007||Feb 24, 2009||Rambus Inc.||Integrated circuit memory device having delayed write timing based on read response time|
|US7516305||Dec 21, 2006||Apr 7, 2009||Seiko Epson Corporation||System and method for retiring approximately simultaneously a group of instructions in a superscalar microprocessor|
|US7523245||Aug 22, 2006||Apr 21, 2009||Opti, Inc.||Compact ISA-bus interface|
|US7523296||Jun 10, 2005||Apr 21, 2009||Seiko Epson Corporation||System and method for handling exceptions and branch mispredictions in a superscalar microprocessor|
|US7558945||Sep 27, 2005||Jul 7, 2009||Seiko Epson Corporation||System and method for register renaming|
|US7603493||Dec 8, 2005||Oct 13, 2009||Micron Technology, Inc.||Dynamically setting burst length of memory device by applying signal to at least one external pin during a read or write transaction|
|US7657712||Aug 30, 2005||Feb 2, 2010||Seiko Epson Corporation||Microprocessor architecture capable of supporting multiple heterogeneous processors|
|US7685402||Jan 9, 2007||Mar 23, 2010||Sanjiv Garg||RISC microprocessor architecture implementing multiple typed register sets|
|US7724590||Oct 6, 2008||May 25, 2010||Rambus Inc.||Memory controller with multiple delayed timing signals|
|US7739482||Dec 21, 2006||Jun 15, 2010||Seiko Epson Corporation||High-performance, superscalar-based computer system with out-of-order instruction execution|
|US7757064||Sep 7, 2006||Jul 13, 2010||Infineon Technologies Ag||Method and apparatus for sending data from a memory|
|US7793039||Jan 6, 2009||Sep 7, 2010||Rambus Inc.||Interface for a semiconductor memory device and method for controlling the interface|
|US7802074||Apr 2, 2007||Sep 21, 2010||Sanjiv Garg||Superscalar RISC instruction scheduling|
|US7848317 *||Nov 25, 2005||Dec 7, 2010||Robert Bosch Gmbh||Communication module system having an interface module and interface module|
|US7870357||Sep 30, 2008||Jan 11, 2011||Rambus Inc.||Memory system and method for two step memory write operations|
|US7917669||Jun 30, 2004||Mar 29, 2011||Nokia Corporation||Multiphase addressing method for transferring address information|
|US7934078||Sep 17, 2008||Apr 26, 2011||Seiko Epson Corporation||System and method for retiring approximately simultaneously a group of instructions in a superscalar microprocessor|
|US7941636||Dec 31, 2009||May 10, 2011||Intellectual Venture Funding Llc||RISC microprocessor architecture implementing multiple typed register sets|
|US7958337||Feb 26, 2009||Jun 7, 2011||Seiko Epson Corporation||System and method for retiring approximately simultaneously a group of instructions in a superscalar microprocessor|
|US7979678||May 26, 2009||Jul 12, 2011||Seiko Epson Corporation||System and method for register renaming|
|US7984207||Aug 19, 2009||Jul 19, 2011||Round Rock Research, Llc||Dynamically setting burst length of double data rate memory device by applying signal to at least one external pin during a read or write transaction|
|US8019913||Jul 15, 2009||Sep 13, 2011||Round Rock Research, Llc||Dynamically setting burst length of double data rate memory device by applying signal to at least one external pin during a read or write transaction|
|US8019958||Sep 3, 2010||Sep 13, 2011||Rambus Inc.||Memory write signaling and methods thereof|
|US8045407||Apr 8, 2010||Oct 25, 2011||Rambus Inc.||Memory-write timing calibration including generation of multiple delayed timing signals|
|US8074052||Sep 15, 2008||Dec 6, 2011||Seiko Epson Corporation||System and method for assigning tags to control instruction processing in a superscalar processor|
|US8140805||Dec 21, 2010||Mar 20, 2012||Rambus Inc.||Memory component having write operation with multiple time periods|
|US8156262||Aug 18, 2011||Apr 10, 2012||Round Rock Research, Llc||Dynamically setting burst length of double data rate memory device by applying signal to at least one external pin during a read or write transaction|
|US8205056||Sep 12, 2011||Jun 19, 2012||Rambus Inc.||Memory controller for controlling write signaling|
|US8214616||May 29, 2007||Jul 3, 2012||Rambus Inc.||Memory controller device having timing offset capability|
|US8218382||Sep 8, 2011||Jul 10, 2012||Rambus Inc.||Memory component having a write-timing calibration mode|
|US8238467||Jun 24, 2009||Aug 7, 2012||Massachusetts Institute Of Technology||Digital transmitter|
|US8238470||Apr 20, 2011||Aug 7, 2012||Massachusetts Institute Of Technology||Digital transmitter|
|US8243847||Oct 1, 2009||Aug 14, 2012||Massachusetts Institute Of Technology||Digital transmitter|
|US8254491||Aug 31, 2006||Aug 28, 2012||Massachusetts Institute Of Technology||Digital transmitter|
|US8259841||Feb 15, 2011||Sep 4, 2012||Massachusetts Institute Of Technology||Digital transmitter|
|US8281052||Apr 9, 2012||Oct 2, 2012||Round Rock Research, Llc|
|US8311147||Apr 21, 2011||Nov 13, 2012||Massachusetts Institute Of Technology||Digital transmitter|
|US8320202||Jun 25, 2007||Nov 27, 2012||Rambus Inc.||Clocked memory system with termination component|
|US8359445||Jan 27, 2009||Jan 22, 2013||Rambus Inc.||Method and apparatus for signaling between devices of a memory system|
|US8363493||Jul 9, 2012||Jan 29, 2013||Rambus Inc.||Memory controller having a write-timing calibration mode|
|US8391039||Nov 15, 2005||Mar 5, 2013||Rambus Inc.||Memory module with termination component|
|US8395951||May 2, 2012||Mar 12, 2013||Rambus Inc.||Memory controller|
|US8462566||Apr 29, 2008||Jun 11, 2013||Rambus Inc.||Memory module with termination component|
|US8493802||Jan 14, 2013||Jul 23, 2013||Rambus Inc.||Memory controller having a write-timing calibration mode|
|US8504790||Mar 19, 2012||Aug 6, 2013||Rambus Inc.||Memory component having write operation with multiple time periods|
|US8537601||Jul 6, 2012||Sep 17, 2013||Rambus Inc.||Memory controller with selective data transmission delay|
|US8560797||Mar 15, 2012||Oct 15, 2013||Rambus Inc.||Method and apparatus for indicating mask information|
|US8625371||Jun 21, 2013||Jan 7, 2014||Rambus Inc.||Memory component with terminated and unterminated signaling inputs|
|US8681837||Nov 9, 2010||Mar 25, 2014||Massachusetts Institute Of Technology||Digital Transmitter|
|US8717837||May 22, 2013||May 6, 2014||Rambus Inc.||Memory module|
|US8743636||May 9, 2013||Jun 3, 2014||Rambus Inc.||Memory module having a write-timing calibration mode|
|US8760944||Jun 21, 2013||Jun 24, 2014||Rambus Inc.||Memory component that samples command/address signals in response to both edges of a clock signal|
|US8761235||Jun 10, 2013||Jun 24, 2014||Massachusetts Institute Of Technology||Digital transmitter|
|US8923433||Feb 3, 2014||Dec 30, 2014||Massachusetts Institute Of Technology||Digital transmitter|
|US8989303||Jan 31, 2014||Mar 24, 2015||Massachusetts Institute Of Technology||Digital transmitter|
|US9053778||Dec 12, 2013||Jun 9, 2015||Rambus Inc.||Memory controller that enforces strobe-to-strobe timing offset|
|US20040114454 *||Nov 20, 2003||Jun 17, 2004||Rambus Inc.||Memory device and method for operating same|
|US20040139285 *||Dec 18, 2003||Jul 15, 2004||Intel Corporation||Memory component with multiple transfer formats|
|US20040170072 *||Dec 11, 2003||Sep 2, 2004||Rambus Inc.||Method and apparatus for coordinating memory operations among diversely-located memory components|
|US20040186950 *||Mar 31, 2004||Sep 23, 2004||Masashi Hashimoto||Synchronous DRAM system with control data|
|US20050030802 *||Sep 14, 2004||Feb 10, 2005||Rambus Inc.||Memory module including an integrated circuit device|
|US20050033903 *||Sep 14, 2004||Feb 10, 2005||Rambus Inc.||Integrated circuit device|
|US20050141332 *||Oct 27, 2004||Jun 30, 2005||Rambus Inc.||Semiconductor device including a register to store a value that is representative of device type information|
|US20050160241 *||Feb 15, 2005||Jul 21, 2005||Rambus Inc.||High performance cost optimized memory|
|US20050169097 *||Mar 31, 2005||Aug 4, 2005||Rambus Inc.||Method and apparatus for coordinating memory operations among diversely-located memory components|
|US20050228973 *||Jun 10, 2005||Oct 13, 2005||Seiko Epson Corporation|
|US20060007761 *||Sep 1, 2005||Jan 12, 2006||Ware Frederick A||Memory module with termination component|
|CN100504826C||Jun 30, 2004||Jun 24, 2009||诺基亚公司||An improved interface|
|DE4010384A1 *||Mar 31, 1990||Oct 11, 1990||Intel Corp||Verfahren zur uebertragung von buendeldaten in einem mikroprozessor|
|EP0423036A2 *||Oct 11, 1990||Apr 17, 1991||AST RESEARCH, Inc.||CPU-bus controller|
|EP1784734A1 *||Jun 30, 2004||May 16, 2007||Nokia Corporation||An improved interface|
|EP1816569A2||Apr 16, 1991||Aug 8, 2007||Rambus Inc.||Integrated circuit I/O using a high performance bus interface|
|WO1991016680A1 *||Apr 16, 1991||Oct 31, 1991||Rambus Inc||Integrated circuit i/o using a high preformance bus interface|
|WO1998003922A2 *||Jul 16, 1997||Jan 29, 1998||Dufal Frederic||Method and device providing time synchronisation between a processing unit and external means|
|WO2006010975A1 *||Jun 30, 2004||Feb 2, 2006||Ashley Crawford||An improved interface|